Fuel shut off on C5
Thread Starter
Racer
Joined: Jan 2007
Posts: 284
Likes: 0
From: Elysburg PA
Fuel shut off on C5
Does the LS engines fuel shut off when oil pressure is to low? One would think that the GM engineers designed a oil pressure sending unit that would interact with the fuel delivery system to shut off in the event of low oil pressure. With the column lock problem on early C5's, I have read that it would shut off the fuel delivery system. I raise this question on a recent post that a C5 lost all of its oil because of a oil filter malfuntion or hitting something on the roadway. Most industrial engines have low oil safe guards. Anybody have an experience with this situation?
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
Lookng in my EFILIVE software I see that there is a "Low Oil Pressure"
warning system in place--The warning lite comes on at specified low oil pressures according to engine RPM-- At 500 RPM it comes on at 5 PSI--at 2000-11 PSI----at 4000-18 PSI and at 6000- 24 PSI
The only engine shut off i see is for coolant overtemp--The engine will go into "hot fueling mode" at 270* and will SHUT down at 284* only after it has been there for 409 seconds-----WOW ---Way too late by my way of thinking !!!
warning system in place--The warning lite comes on at specified low oil pressures according to engine RPM-- At 500 RPM it comes on at 5 PSI--at 2000-11 PSI----at 4000-18 PSI and at 6000- 24 PSI
The only engine shut off i see is for coolant overtemp--The engine will go into "hot fueling mode" at 270* and will SHUT down at 284* only after it has been there for 409 seconds-----WOW ---Way too late by my way of thinking !!!
Racer
Joined: Oct 2008
Posts: 249
Likes: 0
From: Heath Texas
Fuel pump power line
Where is the easiest, most convenient place to find the positive power wire to the fuel pump on an 03 Z?
I've got the shop manual, but I'm too new to decipher. Prefer to catch the wire aft before it hits the bundles up front.
I've got the shop manual, but I'm too new to decipher. Prefer to catch the wire aft before it hits the bundles up front.
Le Mans Master
Joined: Nov 2005
Posts: 6,993
Likes: 25
Many modern fuel injected cars turn off the fuel pump when oil pressure goes to 0-the asumption being the car may have been in an accident killing the engine so you want to cut off fuel flow to stop possible fuel fires.
Le Mans Master
Joined: Sep 2003
Posts: 8,847
Likes: 795
From: Longview Texas
Is this also assuming that all oil pressure sensors fail with a max. oil pressure reading and not zero? It would not be good for your car to shutoff at freeway speed just because the oil pressure sensor failed.
Burning Brakes
Joined: Aug 2006
Posts: 753
Likes: 2
From: Denville NJ
You can find the wiring to the fuel pump behind the left rear wheel well inner fender. Jack it up, remove the tire, then the few screws around the front portion. You will find a wire bundle and connector to the fuel pump, I seem to remember that it was a gray wire that ran the pump.
With the schematic in you manual it will make a lot of sense once the fender is opened up, not a difficult job.
With the schematic in you manual it will make a lot of sense once the fender is opened up, not a difficult job.
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